贵港地区降水资源特征分析

Precipitation resources characteristic analysis for Guigang City

利用广西贵港地区3个气象站1960-2009年的降水资料,运用统计学方法,分析该地区近50年来降水资源的农业气候特征,结果表明:贵港地区的年降水量整体呈减少趋势,且年内分配不均,5-6月降水量最多,稳定性高,12月降水量最少,稳定性较差;汛期降水量占全年降水量的79%;在各级降水日数中,小雨日数最多,但其对年降水量的贡献却亚于暴雨量级的贡献,中雨、大雨和暴雨是贵港地区年降水量的主要来源。

Based on the precipitation records of three meteorological stations in Guigang City within the period from 1960 to 2009,the author analyzed by statistics method the agro-climate characteristics of this area in last 50 years.The results of analysis demonstrate that the annual precipitation is dropping overall and distributes unevenly within a year.May and June see the maximum precipitation with high stability while December has the minimum precipita tion with relatively poor stability.Precipitation of flood period accounts for 79% of annual amount.Total days with light rain rank first of all precipitation days but total precipitation is less than that contributed by days with rain storm.Moderate rain,heavy rain and rainstorm are the major sources of annual precipitation of Guigang City.